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Income Taxes (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 10 Months Ended |
--- | --- | --- | --- | ---
May 31, 2021 | Feb. 28, 2021 | May 31, 2020 | May 31, 2021 | May 31, 2020 | Dec. 31, 2020 | Nov. 30, 2020
Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |  |  |
Income tax expense | $ 30,300,000 |  | $ 15,800,000 | $ 56,800,000 | $ 24,900,000 |  |
Effective tax rate | 17.40% |  | 23.30% | 19.10% | 18.20% |  |
Excess tax benefits related to stock-based compensation | $ (400,000) |  |  | $ (3,900,000) | $ (5,600,000) |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount | 1,900,000 |  | $ 1,000,000.0 | 3,300,000 | 2,000,000.0 |  |
Income Taxes Receivable, Alternative Minimum Tax, CARES Act |  |  | 39,300,000 |  |  |  |
Tax credits | (14,800,000) |  | (3,000,000.0) | (17,500,000) | (7,000,000.0) |  |
Deferred tax assets | 217,400,000 |  |  | 217,400,000 |  |  | $ 249,100,000
Valuation allowance | 18,000,000.0 |  |  | 18,000,000.0 |  |  | 18,000,000.0
Deferred Tax Assets, Tax Credit Carryforwards | 0 |  | $ 82,617,000 | 0 | 82,617,000 |  |
Adjustments to deferred tax valuation allowance |  |  |  | 0 |  |  |
Gross unrecognized tax benefits (including interest and penalties) | 0 |  |  | 0 |  |  | $ 0
CARES Act Employee Retention Credit |  | $ 4,300,000 |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense, Tax Benefit | $ 400,000 |  |  | $ 3,900,000 | $ 5,600,000 |  |
Maximum [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
RefundableTaxCreditAllowedPerEmployeeCARESAct |  |  |  |  |  | $ 5,000 |

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